Really good calculator here:
http://www.cda.org.uk/megab2/build/pub124/sec3.htm#4.3 Copper Tube Sizing
, it's what I used for my installation. Should let you calculate the effect of
15mm followed by a 22mm length.
On 29 Aug 2003 15:33:43 -0700, email@example.com wrote:
In order to work this out, the maximum ratings of both appliances are
needed, as well as the meter position relative to this lot.
Almost certainly, with typical appliances, one can say that 15mm tube
over the distances mentioned are not enough.
has information and a worked example, so you can at least get an idea
of what is involved.
The pipework should be designed so that the pressure drop between the
outlet of the meter and the appliance does not exceed 1mbar at maximum
Option A *may* be adequate if the boiler is relatively small, but you
would need to do the sums.
Same for Option B although again the calculations are required. This
would likely be required for a larger or combi boiler, and I suspect
the calaculations would show it to be belt and braces for a smaller
Option C seems similar to Option A.
Getting the pressures right is important both for operational and
From the perspective of doing any DIY work, the law requires you to be
competent if you want to do your own fitting work, but does not define
it. Professional fitters are required to be CORGI members.
There are a bunch of issues associated with installing a hob as well
as installing a boiler that have to do with fitting arrangements,
flues, ventilation and so on. The fact that the pipe sizing issue is
probably wrong invites the question as to whether anything else is
There is more information in Ed Sirett's gas fitting FAQ
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
To email, substitute .nospam with .gl
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